Freelance Senior iOS Developer role (fully remote, Warsaw office available). Paid hourly B2B (90–180 PLN/h). Responsibilities: build and maintain iOS apps communicating with BLE hardware, write unit tests (XCTest/Quick/Nimble) with a TDD mindset, maintain CI/CD (GitHub Actions/Bitrise/Travis), review PRs, and collaborate with firmware, design, QA, and PMs. Path to permanent contract possible after initial 3 months.

Join as a freelance Mobile Developer owning the mobile side of connected-product projects (wearables, sensors, health-tech). Design and implement robust BLE communication flows, debug device interactions, and work alongside firmware, backend, design, QA and PMs. Role is fully remote (optional Warsaw/Gdansk offices), paid 90–180 PLN/h B2B, with a path to a permanent contract after a successful initial 3-month period. Recruitment and day-to-day work in English (B2+).

Join Yazio's Food Tracking squad to build core mobile experiences using Kotlin Multiplatform. Responsibilities include owning features end-to-end, planning and executing migration to KMP-first code, integrating AI-powered features with backend teams, mentoring peers, and collaborating with Product and Design. Core tech: KMP, Kotlin, Jetpack Compose, SwiftUI, kotlinx.coroutines, Ktor, SQLDelight.

Join the Deployment Platform team to design, build, and maintain cross-platform mobile applications (Flutter/Dart with native iOS/Android as needed), implement IoT/hardware integrations (NFC, BLE, Wi‑Fi, beacons), leverage LLMs (Azure OpenAI, Gemini) for agentic installation workflows, and contribute across frontend/backend services within a modular monorepo. Requires 5+ years mobile experience and strong state management, testing, and full-stack aptitude.

Kraken is hiring a Staff React Native Engineer to own the technical vision and architecture of the Kraken Pro mobile app, working with React Native and TypeScript to improve performance, reliability, and scalability. The role requires 8+ years of software engineering experience, deep mobile expertise (iOS/Android), and experience leading or mentoring engineers across teams. Hiring is open in the countries listed in the posting.

Responsible for migrating native Kotlin apps to Ionic, developing and maintaining hybrid apps with Ionic/Angular/Capacitor, integrating native Android features, consuming REST APIs, designing modular frontend architectures (Clean Architecture, MVVM, Feature Modules), managing mobile builds for Android/iOS and resolving hybrid mobile issues. Location: Lima (hybrid, 1–2 days/week on site).

Work on Mapbox's Maps SDK to design and implement scalable Android SDK features and APIs, drive cross-SDK integrations (Maps, Navigation, Search), improve code quality and developer experience, and mentor engineers. Role emphasizes Kotlin/Java native development, debugging and profiling, API design, SDK quality, and optionally C++/AOSP familiarity.

Lead the design and implementation of a modular, easy-to-integrate iOS video player and collaborate with backend/CDN teams to optimize global media delivery and performance. Work cross-functionally with product and design, set engineering standards, and mentor other engineers. Requires 8+ years building user-facing native iOS applications with Swift and deep knowledge of AVFoundation, Core Media, Core Video, streaming protocols (HLS, MPEG-DASH, MP4), and CDN integration. Role is remote (United States) and listed with a base salary range of $217,000–$303,000 USD.

Fingerprint is hiring a Senior Android Engineer based in EMEA to lead development of Android products (proprietary and open-source SDKs and demo apps). The role requires 5+ years of native Android development, strong Kotlin and Android SDK skills, experience with Jetpack Compose, familiarity with C++ and Android internals, and a background in information security. The company is remote-first and does not sponsor visas.

Lead architecture and performance efforts for Reddit's iOS app: define architecture and best practices, improve modularity and scalability, set and measure performance goals (ANR, app launch time/TTI/TTFF, dropped frames), improve observability/telemetry, and mentor iOS engineers across the company. Requires 10+ years software development experience with at least 5+ years designing/developing iOS applications.

Senior Software Engineer focused on Android: own architecture and implementation of native Kotlin apps using Jetpack Compose and Clean Architecture. Collaborate with PMs, designers, QA, and engineers; write tests, ship to Google Play, mentor peers, and participate in code reviews. Requires at least 7 years of professional Android development experience.

Tide is hiring a Senior Engineer focused on Flutter to design, build and maintain mobile products for its Business Areas. The role involves contributing to a large modular Dart codebase (Melos), using tools such as flutter_bloc, get_it, injectable, auto_route, freezed, and code-generation workflows, and applying BDD and automated testing practices. The position offers a flexible working model and a reported gross annual salary range of €38,400–€48,000.

Responsible for the motion and interaction layer of the Kraken mobile app (React Native). Work includes building and evolving animated components and motion tokens, profiling and optimising rendering performance (especially on lower-end Android), bridging to native when needed, and partnering with product designers to ship refined motion and interaction experiences.

Role to own the motion and interaction layer of Kraken's React Native mobile app: implement and evolve animated components and motion tokens, optimize rendering performance (especially on lower-end Android), bridge to native when needed (Swift/Kotlin), and collaborate closely with product designers to ship high-quality interaction work.

Planner 5D seeks an Android Team Lead with 7+ years of Android experience to own Android development, make technical decisions, mentor developers, and implement complex features (graphics, multiplayer, AI, CRDT). Required skills include Kotlin, Java, Jetpack, Dagger, Coroutines/RxJava, Room/SQLite, REST/Protobuf, testing, and in-app payments. Locations listed include several European cities and Poland.

Build and improve Replit's mobile experience (React Native, TypeScript, Expo, Apollo/GraphQL, Swift, Kotlin). Responsibilities include shipping features, optimizing UI rendering performance, debugging and deploying iOS/Android apps, collaborating with designers and engineers, and improving app quality and observability. Requires 5+ years professional software development experience.

Lead the Nav iOS SDK team to define product roadmaps, drive strategic objectives, and evolve rendering and navigation technologies. Requires 3+ years of engineering management experience, minimum 5+ years in mobile software development (iOS/Android), professional English (C1), and experience with mobile SDKs, maps, navigation or related location technologies.

Work on Mapbox's Navigation SDK for Android, defining architecture and leading cross-functional technical initiatives. Responsibilities include API and SDK design, implementing and improving functionality and developer experience, debugging and profiling for performance, and mentoring peers. Requires experience shipping complex Android apps/SDKs and familiarity with Kotlin and Java; C++ and AOSP experience are noted as beneficial.

Mapbox seeks a Software Development Engineer II for the Navigation SDK team in Minsk to define architecture, lead technical initiatives, and implement scalable features that integrate Navigation, Maps and Search SDKs. The role emphasizes Kotlin/Java Android development, API design, debugging/profiling, SDK developer experience, and collaboration across teams.

Lead a cross-functional engineering team (mobile, backend, platform) to drive monetization and merchandising initiatives. Role emphasizes technical direction, sustainable architecture, partnership with product and data, recruiting and developing engineers. Requires 3+ years of direct management experience and experience delivering high-quality mobile or frontend products; technologies likely include Kotlin/Java, AWS (ECS, SQS, RDS), and modern mobile stacks (Swift/SwiftUI, Android/Jetpack Compose).